Fig. 2

HBE-Dp71 AS cells displayed increased DNA damage induced by H₂O₂. a Images of comets obtained by alkaline comet assay representing different degrees of DNA damage of HBE cell lines. b Statistical analysis of %Tail DNA measured in three HBE cell lines using CometScore software proved that the differences were significant. c γ-H2AX nucleus foci formation in HBE cell lines. After the three HBE cells were treated by 0.2 mM H₂O₂, more γ-H2AX nuclear foci were formed in HBE-Dp71 AS cells (scale bar: 50 μm). d Statistical analysis showed that the differences between the γH2AX foci formed per cell induced by H₂O₂ were significant